2009 BMW M3 4.0L Petrol · M3 TXV

The 2009 BMW M3 presents a generally sound mechanical picture, though the most recent MOT on 23 August 2025 at 74,898 miles flagged two advisories that warrant attention. The nearside rear upper suspension arm ball joint has slight play, and the offside rear exhaust has a minor gas leak. Neither defect caused a failure, but both indicate the car is entering a phase where age-related wear is beginning to surface. The maintenance trend is broadly stable rather than sharply worsening, particularly given the clean bills of health recorded in 2021, 2022, and 2023. The 2024 test at 70,979 miles did highlight a cut in the offside front tyre and a nearside rear service brake binding, both of which appear to have been addressed before the 2025 test, suggesting the previous owner responded to advisories rather than ignoring them. The mileage pattern tells an interesting story. Across the five-year MOT history from August 2021 to August 2025, the car covered just 13,554 miles, averaging roughly 2,711 miles per year. That is notably low even for a car of this age and is well below the typical UK annual average of around 7,000 to 8,000 miles. The jump from 67,775 miles in August 2023 to 70,977 miles in August 2024 accounts for 3,202 miles in a single year, which is modest but represents the most active twelve-month period on record. The car then appears to have covered only two miles between the August 2024 and August 2025 tests, raising the possibility that the 2025 test was conducted at or very near the same mileage as the last recorded figure. Whether the car has been sitting unused or the mileage reading reflects a genuine pause in use, prolonged inactivity can introduce its own concerns, including deteriorated brake surfaces, flat-spotted tyres, dried seals, and moisture ingress in fluid systems. A prospective buyer should focus the physical inspection on the rear suspension and exhaust system. The ball joint play flagged in 2025 is a progressive wear item; if left unattended, it can lead to uneven tyre wear, vague steering, and ultimately a dangerous loss of suspension geometry. Have a workshop check the nearside rear upper arm and its bushings for play and deterioration. The minor exhaust leak on the offside rear side could stem from a deteriorating gasket, a corroded joint, or a hairline crack in the silencer. Given the car's age and low use, corrosion rather than heat fatigue is the more likely culprit. Inspect the full exhaust for rust, particularly around welds and mounting points. The binding rear brake noted in 2024 may have been resolved, but it is worth verifying that the nearside rear caliper slides and pistons move freely and that the disc shows no signs of uneven scoring or heat damage. Low-mileage cars are prone to caliper seizure because components do not get the regular heat cycling and movement that keeps them operational. Check the handbrake mechanism on that side as well, since the M3's parking brake uses a drum-in-disc setup that can corrode and stick. Finally, inspect all four tyres for age-related cracking and sidewall deterioration, as tread condition alone does not reveal the full story on a car that may have spent extended periods stationary.